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Multi-transformations in rapid solidification of highly undercooled hypoeutectic Ni-Ni_3B alloy melt

机译：高度过冷的过共晶Ni-Ni_3B合金熔体的快速凝固多相转变

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摘要

The solidification of undercooled Ni-3.3 wt% B alloy was studied by high-speed video analysis and microstructural analysis. For moderate initial undercooling (ΔT_p = 75 K), the solidification interface for primary phase transformation manifests a shape of a planar dendrite, and possesses an constant growth velocity, for eutectic transformation whereas the interface presents multi-dendrite shape and spasmodic growth, so that a constant velocity cannot describe the interface exactly. These differences suggest that primary phase solidification is controlled by far-distance diffusion while eutectic solidification by short-distance diffusion. For large initial undercooling (ΔT_p = 262 K), a kinds of large "white dendrites", which is in fact composed of multiple phases, were found in the microstructure, from inside to outside of which, the eutectic phase changes from dot phases (anomalous structure) to irregular eutectic and then to regular eutectic, indicating that the center of "white dendrites" may be the nucleation zone of eutectic reaction.
机译：通过高速视频分析和显微组织分析研究了过冷的Ni-3.3 wt％B合金的凝固。对于适度的初始过冷（ΔT_p= 75 K），用于初相转变的凝固界面表现出平面枝晶形状，并具有恒定的生长速度（对于共晶转变），而界面表现出多枝晶形状和痉挛生长，因此恒定的速度无法准确描述界面。这些差异表明，初相凝固受远距离扩散控制，而共晶凝固受短距离扩散控制。对于较大的初始过冷度（ΔT_p= 262 K），在微观结构中发现了一种实际上由多相组成的大的“白色树枝状晶体”，从内部到外部，共晶相从点相变化（异常结构），先是不规则共晶，然后是规则共晶，表明“白色树枝状晶体”的中心可能是共晶反应的成核区。

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  • 来源
    《Journal of Materials Research》 |2015年第21期|3307-3315|共9页
  • 作者

    Junfeng Xu; Di Zhang; Feng Liu; Zengyun Jian;

  • 作者单位

    The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an, Shaanxi Province 710021, People's Republic of China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi Province 710072, People's Republic of China;

    The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an 710021, People's Republic of China State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi Province 710072, People's Republic of China;

    The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an, Shaanxi Province 710021, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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